KR102644987B1 - Driving Apparatus for Actuator Having BLDC Motor - Google Patents

Abstract

The present invention relates to a drive motor having a slim BLDC motor mounted vertically inside a housing.
The driving device for an actuator according to the present invention includes a housing having first and second accommodating spaces inside a rectangular cylindrical body case, and a rotor bearing protruding from the bottom of the first accommodating space; A rotor in which the lower end of the rotor support body is rotatably coupled to the outer circumference of the rotor bearing; and a stator disposed on the outside of the rotor with an air gap and generating a rotating magnetic field to rotate the rotor, wherein a first worm gear is integrally formed on the upper outer periphery of the rotor support.

Description

Driving Apparatus for Actuator Having BLDC Motor}

The present invention relates to a driving device, and particularly to a driving device for an actuator having a slim BLDC (Brushless DC) motor mounted vertically inside a housing.

An electric actuator serves to rotate or linearly move a driven object with high-torque torque obtained by converting the rotational force generated from a rotational power source into torque.

In general, conventional actuators use a DC motor as a rotational power source, and the rotor output of the DC motor is generated by a gear train (worm gear formed integrally with the rotor output end and a plurality of spur gears combined). Torque is converted through a gear train to generate high torque rotation output from the actuator output end.

Since these conventional electric actuators use a DC motor with an external casing as a rotational power source, the magnet for sensing the position of the rotor cannot be built into the casing, but is attached separately to the outside and sensed using a Hall sensor, so the motor drive circuit is built in. The structure of connecting the Hall sensor to the printed circuit board (PCB) is complex.

If the actuator does not use a Hall sensor, only forward and reverse rotation movements are possible.

In general, due to the characteristics of the actuator, the overall housing height is low and the product is configured to be long either horizontally or vertically, so it is difficult to adopt a structure in which a DC motor with an external casing is mounted vertically on the inner floor of the housing.

When using a DC motor, the stopped position must be maintained when external pressure is applied to the output shaft that rotates forward or reverse, so the braking torque must be increased using a worm gear.

In order to use a worm gear and a worm wheel in a DC motor and transmit power to the location of the output shaft, a spur gear is generally used to connect. In this case, the following problems exist.

First, the height of the actuator's housing is low, which makes it difficult to assemble the DC motor and increases the unit cost. In other words, there is a problem in securing assembly space due to the bearing that must hold the casing and worm shaft of the DC motor.

Second, the structure of connecting the motor power to the controller becomes complicated.

Third, rotor position information is required for accurate position control in the actuator. For this purpose, a magnet for position sensing is placed at the bottom of the worm gear of the DC motor, and a Hall sensor IC for position sensing is applied, so DC power is used and the structure of connecting the Hall sensor to the printed circuit board (PCB) for position sensing is required. complicated.

Fourth, in a gear train that uses multiple spur gears to generate the rotational power of the drive motor to obtain a large reduction ratio, the tolerance increases, resulting in increased backlash and difficult precise position control.

Korean Patent Publication No. 10-2017-0050869 (Patent Document 1) discloses a planetary reduction device including a power input unit including a direct current DC motor, a planetary gear that receives driving force from the power input unit and increases torque, and is provided with an output shaft. a speed increaser that receives driving force from the planetary speed reducer, increases the rotational speed lowered in proportion to the increased torque, and has a detachable cover that opens on one side, and rotates the rotational motion transmitted from the speed increaser into a linear motion. An electric actuator using a direct current motor is disclosed, which includes a screw shaft with square threads for conversion, and a cylinder portion provided with a displacement nut that is rotatably screwed to the screw shaft and moves forward and backward by rotation of the screw shaft.

The electric actuator of Patent Document 1 has a problem in that precise position control is difficult due to the use of a direct current DC motor, and assembly productivity is reduced due to the adoption of a planetary reduction unit to increase torque.

Generally, when the size of the actuator is small, the size of the drive motor is small and the output is small. In this case, in order to obtain a high torque output value at the output stage of the actuator, the rpm of the motor must be large and the reduction ratio must be large by using multiple spur gears, which causes the problem of increased noise.

: Korean Patent Publication No. 10-2017-0050869

Therefore, the present invention was proposed to solve the problems of the prior art described above, and its purpose is to improve the problem of the conventional structure using a DC motor laid down inside a low-height housing, and to install bearings on the cover and the bottom of the housing, respectively. The purpose is to provide a drive device for a slim actuator in which an Almotor-type BLDC motor is installed and assembled vertically on the bottom of the housing.

Another object of the present invention is to provide an actuator that can connect a stator and a PCB using a low-cost press fit without an inner hole instead of an expensive press fit with a shrinkable coupling portion (inner hole) that is press-fitted with a PCB. The purpose is to provide a driving device.

In order to achieve the above object, a driving device for an actuator according to one feature of the present invention has first and second accommodating spaces inside a body case of a rectangular cylindrical shape, and a rotor bearing protrudes at the bottom of the first accommodating space. installed housing; A rotor wherein the lower end of the rotor support is rotatably coupled to the outer periphery of the rotor bearing; and a stator disposed on the outside of the rotor with an air gap and generating a rotating magnetic field to rotate the rotor, wherein a first worm gear is integrally formed on the upper outer periphery of the rotor support.

The rotor has a cup-shaped lower end rotatably coupled to the rotor bearing, and a rotor support body integrally formed with a first worm gear on the upper outer periphery. A back yoke disposed on the lower outer periphery of the rotor support to form a magnetic circuit; and a plurality of magnets disposed on the outer periphery of the back yoke.

In addition, the rotor bearing includes a bearing housing protruding from the bottom of the housing and having a groove formed thereon; and a rotor shaft bearing rotatably mounted in the groove of the bearing housing and whose upper end contacts the lower surface of the rotor support body to reduce friction when the rotor rotates.

In this case, the upper part of the rotor support may be rotatably supported on a rotor shaft bearing inserted into the bottom of the cover.

The stator includes a stator core including a plurality of teeth, each of which has a "T"-shaped tip extending in the axial direction, and a back yoke interconnected with the plurality of teeth to form a magnetic circuit; Upper and lower insulators surrounding the coil winding area of each of the plurality of teeth from the top and bottom; and a coil wound around the outer peripheral surface of the upper and lower insulators, wherein the back yoke is formed in a square shape and a through hole for fixing the back yoke to the body case may be formed at a corner of the square shape.

The driving device for an actuator according to the present invention is disposed on the upper part of the driving motor and further includes a printed circuit board (PCB) on which a motor driving circuit is mounted, and the stator coil of the driving motor and the printed circuit board (PCB) are interconnected. To do this, you can use a press-fit terminal where the tip is press-fitted into the PCB and there is no inner hole.

In this case, a gear train is installed on the upper part of the printed circuit board (PCB) to increase torque by reducing the rotational output of the driving motor, and an output shaft with a second worm wheel on the upper part is installed in the second accommodation space. It can be.

In addition, the gear train includes a first worm wheel and an output worm gear integrally formed at a distance from the power transmission shaft, the first worm wheel is gear-coupled with the first worm gear integrally formed on the upper part of the rotor, and the output worm gear is connected to the first worm gear of the output shaft. 2It can be combined with a gear on a worm wheel to transmit rotational power.

In addition, the driving device for an actuator according to the present invention may further include a Hall sensor that is installed on the lower surface of a printed circuit board (PCB) corresponding to the upper part of the rotor and generates a rotor position signal when the rotor rotates.

As described above, the actuator driving device according to the present invention improves the conventional problem of using a DC motor lying down inside a low-height housing by installing bearings on the cover and the bottom of the housing and assembling them in a vertical direction on the bottom of the housing. It has a BLDC motor with a structure that

In addition, in the present invention, since a printed circuit board (PCB) with a built-in motor driving circuit is installed on the upper part of the driving motor, a Hall sensor for detecting the rotor position signal can be directly mounted on the lower surface of the printed circuit board (PCB). Therefore, a BLDC motor can be easily adopted as a drive motor.

In the present invention, the stator and the PCB can be connected using a low-cost press fit without an inner hole instead of an expensive press fit with a shrinkable coupling portion (inner hole) that is press-fitted to the PCB.

In the present invention, a multi-row screw output worm gear can be provided as a gear train to prevent the reduction gear ratio from increasing while lowering the rpm of the drive motor, which is a factor in increasing noise.

In addition, in the present invention, the power transmission shaft in which the worm wheel and worm gear, which constitute a small drive motor and gear train, are integrated, can be optimally placed inside the housing to miniaturize the size.

In the present invention, backlash can be minimized by a gear train change structure that minimizes the number of combined gears by using a power transmission shaft in which a worm wheel and a worm gear are integrally formed at intervals, and a gear train combining a plurality of spur gears In comparison, the overall size is reduced and space can be secured, increasing design freedom and reducing costs.

In addition, in the present invention, an upper/lower slip gear coupling is provided on the output shaft, and when an external force exceeding a preset force is applied to the driven body, slip is generated at the slip gear coupling to prevent damage to the internal structure due to the return of the driven body. It has an output axis with a slip function.

1A to 1D are a perspective view, a plan view, and a cross-sectional view along the line AA and BB of FIG. 1B, respectively, of an actuator using a BLDC-type drive motor according to an embodiment of the present invention.
Figure 2 is a completely exploded perspective view of the actuator shown in Figure 1.
Figures 3a and 3b are a perspective view with the cover removed and an exploded perspective view for each module of the actuator shown in Figure 1, respectively.
FIGS. 4A to 4C are diagrams illustrating a structure in which power is transmitted from a drive motor to an output terminal using a power transmission shaft in the actuator shown in FIG. 1 .
Figure 5 is a flow chart showing the assembly sequence of the actuator according to the present invention.
Figure 6 is a perspective view showing the upper/lower slip gear coupling applied to the output shaft of the actuator according to the present invention.
Figure 7 is a front view showing a worm gear rotor applied to a BLDC type drive motor according to an embodiment of the present invention.
FIGS. 8A to 8C are perspective views showing a cover combined with the cover, housing, and power transmission shaft of the actuator shown in FIG. 1, respectively.
Figure 9a is a partially enlarged perspective view of a stator to which a conventional press fit terminal is applied.
Figures 9b to 9d are for illustrating the connection structure between a BLDC type drive motor and a PCB on which the motor drive circuit is mounted according to an embodiment of the present invention, respectively, and are a perspective view of a stator to which a press-fit terminal is applied, and a press-fit terminal. This is a perspective view and a cross-sectional view showing the structure in which the press fit terminal is connected to the bobbin.

Hereinafter, preferred embodiments according to the present invention will be described with reference to the attached drawings.

In this process, the size or shape of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. Additionally, terms specifically defined in consideration of the configuration and operation of the present invention may vary depending on the intention or custom of the user or operator. Definitions of these terms should be made based on the content throughout this specification.

The actuator according to the present invention is used to move the driven body forward or backward or rotate it, and in the following description, the actuator that drives the driven body using a BLDC type drive motor as a power source will be explained.

Referring to FIGS. 1 to 9B, the actuator 100 according to an embodiment of the present invention includes a housing 10 having first and second receiving spaces 15a and 15b therein; A drive motor 50 installed in the first receiving space 15a of the housing 10, configured in a BLDC manner, and generating rotational output from the rotor 30; A printed circuit board (PCB) 51 installed above the drive motor 50 and equipped with a motor drive circuit that generates a motor drive signal upon receipt of an external control signal; A gear train 70 for reducing the rotational output of the drive motor 50 and transmitting it to the output shaft 80 and increasing torque by reducing the rotational speed; and an output shaft 80 that is installed in the second receiving space 15b of the housing 10 and outputs the torque-increased rotational output transmitted through the gear train 70 to the outside of the housing 10.

The housing 10 includes a rectangular cylindrical body case 12 with an open top and first and second receiving spaces 15a and 15b inside, and a cover covering the upper part of the body case 12 ( 11) is included.

In the first receiving space 15a of the body case 12, a drive motor 50, which is made of a BLDC type and generates rotational output from the rotor 30, is installed vertically from the bottom of the housing 10. An output shaft 80 that outputs the increased torque to the outside of the housing 10 is installed in the second receiving space 15b.

In addition, four first protrusions 12a, which are used when fixing the cover 11 to the body case 12 using fixing screws, protrude from the four inner corners of the body case 12, and the first accommodation Four second protrusions 12b protrude from the four corners of the space 15a to support the printed circuit board (PCB) 51 at a distance from the floor. ), four third protrusions 12c necessary for fixing the stator core 41 of the stator 40 protrude.

Moreover, the first receiving space 15a of the body case 12 includes a bearing housing ( 14) protrudes, and in the second receiving space 15b, a second axis 83b of the output shaft 80 is rotatably supported when the second axis 83b extends to the outside of the body case 12. A bearing housing 60 that accommodates/supports a pair of output shaft bearings 61 and 62 is integrally formed.

The first and second receiving spaces 15a and 15b of the body case 12 are provided with first and second power sources for rotatably supporting both ends of the power transmission shaft 71 of the gear train 70, which will be described later. A pair of bearing housings (75a, 75b) that accommodate/support the transmission shaft bearings (74a, 74b) protrude and are formed as one piece.

Support brackets 13a-13d necessary for fixing the actuator 100 to the main body with fixing screws, etc. are protruded from the four corners of the body case 12, and each has a single through hole.

A rotor shaft bearing 64 is inserted into the bottom of the cover 11 to rotatably support the upper part of the rotor support 33, and rotatably supports the upper part of the first shaft 83a of the output shaft 80. The output shaft bearing 63 is inserted. Accordingly, circular protrusions 11a and 11b are protruded from the upper surface of the cover 11 to secure a space into which the rotor shaft bearing 64 and the output shaft bearing 63 are inserted.

In addition, as shown in FIGS. 8A to 8C, a very strong external pressure is applied to the bottom of the cover 11 to the worm gear 73 of the power transmission shaft 71, causing the power transmission shaft 71 to bend or deviate. First and second guide protrusions 11c and 11d for guiding two points of the power transmission shaft 71 are protruded at intervals to block the power transmission shaft 71 from occurring.

The first and second guide protrusions (11c, 11d) each have a pair of protrusions disposed on the left and right sides to prevent the power transmission shaft 71 from being bent or separated, and the first guide protrusion (11c) is formed between the first power transmission shaft bearing 74a and the first worm wheel 72 of the power transmission shaft 71, and the second guide protrusion 11d is formed between the first worm wheel 72 of the power transmission shaft 71. ) and the output worm gear (73).

The drive motor 50 is of the BLDC type, and includes a rotor 30 whose lower end is rotatably coupled to the outer periphery of the bearing housing 14 protruding from the bottom of the body case 12, and the rotor 30. It is disposed with an air gap on the outside and includes a stator 40 disposed on the upper surface of the body case 12 to generate a rotating magnetic field to rotate the rotor 30, and the stator 40 of the rotor 30 A first worm gear 35 is formed integrally with the outer peripheral portion of the rotor support body 33 extending upward.

Accordingly, the drive motor 50 is installed in a vertical direction from the bottom of the body case 12.

The magnet 31 disposed on the outer periphery of the back yoke 32 located on the inside of the rotor 30 is made of a plurality of N-pole and S-pole segmented magnet pieces, or is preferably a ring-shaped magnet with an N-pole and an S-pole. A magnet whose S-pole is divided into multi-poles can be used, and the back yoke 32 is installed on the back of the magnet 31 to form a magnetic circuit.

The rotor support 33 of the rotor 30 is shaped like a cup so that the lower end is rotatably coupled to the bearing housing 14. In this case, the bearing housing 14 has a groove inside, and the groove is made of plastic, and the upper end is in contact with the lower surface of the rotor support 33, and the rotor shaft bearing 36 reduces friction when the rotor rotates. ) is inserted.

As shown in FIG. 7, the rotor 30 has a structure in which a back yoke 32 and a magnet 31 are disposed on the lower side of the rotor support 33, and a first worm gear 35 is formed integrally with the upper side. You can.

In addition, a ball 35a is provided between the hollow upper part of the rotor support 33 and the rotor shaft bearing 64 inserted into the bottom of the cover 11 to reduce friction when the rotor 30 rotates. This is inserted.

The stator 40 is provided with a plurality of teeth 42, each of which has a “T”-shaped tip extending in the axial direction, and a back yoke 41 that is interconnected with the plurality of teeth 42 to form a magnetic circuit. a stator core (45); Upper and lower insulators 44a and 44b surrounding the outer peripheral surface of each of the plurality of teeth 42 on which the coil 43 will be wound, that is, the coil winding area, from the upper and lower sides; and a coil 43 wound on the outer peripheral surface of the upper and lower insulators 44a and 44b.

In this case, as shown in FIG. 8B, it is also possible to form a bobbin 44 (see FIG. 9B) made of an insulating material that is integrally formed with the teeth 42 instead of the upper and lower insulators 44a and 44b. . The bobbin 44 may be formed integrally with a stator support body surrounding the back yoke 42 along with a plurality of teeth 41.

A printed circuit board (PCB) 51 is installed on the upper side of the drive motor 50, on which a motor drive circuit that generates a motor drive signal upon reception of an external control signal is mounted.

The rotational output of the drive motor 50 is obtained from the first worm gear 35 integrally formed on the upper side of the rotor 30, and the first worm gear 35 is formed through a through hole of the printed circuit board (PCB) 51. It extends upward through.

As shown in FIGS. 4A to 4C, on the upper part of the printed circuit board (PCB) 51, the rotation output of the drive motor 50 is reduced and transmitted to the output shaft 80, and the rotation speed is reduced to generate torque. A gear train 70 for increasing the torque is disposed in the longitudinal direction, and the torque transmitted through the gear train 70 is provided in the second receiving space 15b of the housing 10. That is, an output shaft 80 is installed to output outside the bottom of the body case 12.

The gear train 70 has a structure in which a worm wheel 72 and an output worm gear 73 are formed integrally at a distance from the power transmission shaft 71. In this case, the first worm wheel 72 is gear-coupled with the first worm gear 35 formed integrally with the rotor 30, and the output worm gear 73 is gear-coupled with the second worm wheel 82 of the output shaft 80. Rotational power is transmitted to the output shaft (80).

In addition, both ends of the power transmission shaft 71 are rotatable on the first and second power transmission shaft bearings 74a and 74b installed in a pair of bearing housings 75a and 75b formed at both ends of the body case 12, respectively. It is supported.

The gear train 70 of the present invention adopts a structure in which the worm wheel 72 and the output worm gear 73 are integrally formed at intervals on one power transmission shaft 71, thereby changing the gear train to minimize the number of combined gears. It has a power transmission structure that can minimize backlash.

In addition, in the present invention, in order to prevent the reduction gear ratio from increasing while lowering the rpm of the drive motor 50, which is a factor in increasing noise, the output worm gear 73 provided in the gear train 70 may have a multi-row screw structure. .

Moreover, in the present invention, a small drive motor 70 is installed in the vertical direction inside the housing, and a power transmission shaft in which the first worm wheel 72 and the output worm gear 73, which constitute the gear train 70, are integrally formed. (71) can be optimally placed inside the housing 10 to reduce its size.

Among automobile parts, a slip function is required that can be driven by an actuator and extend in a single direction, but can be pushed in one direction due to an accident or unexpected impact.

Figure 6 is a perspective view showing an upper/lower slip gear coupling applied to the output shaft of the actuator shown in Figure 1.

Referring to FIG. 6, the actuator 100 according to the present invention includes a first shaft 83a and a second shaft 83b to which the output shaft 80 is gear-coupled to have a slip function. I'm doing it. The first shaft (83a) has a second worm wheel 82 formed at the top and an upper slip gear (81a) installed at the lower end, and the second shaft (83b) is gear-coupled with the upper slip gear (81a) at the upper end. A lower slip gear (81b) is installed and the lower part extends to the outside of the body case (12).

The upper and lower slip gears (81a) and lower slip gears (81b) are each in the form of triangular teeth and are engaged at the top and bottom, so they can move when external pressure is applied in a single direction.

In addition, the slip gears 81a and 81b may be used with a coil spring or leaf spring 84 coupled to the lower side of the lower slip gear 81b so that slip occurs only when a certain force or more is applied. .

The upper part of the first shaft (83a) is rotatably supported on the output shaft bearing 63 installed in the cover 11, and the second shaft (83b) is supported by a pair of output shaft bearings 61 and 62 installed in the bearing housing 60. ), and the second axis 83b of the output shaft 80 extends to the outside of the body case 12.

A key groove (83c) is formed on the second axis (83b) extending outward from the body case (12), and a portion of the output coupling portion (20) used for coupling with the driven body is inserted into the key groove (83c). It can be combined using the key 21.

As described above, in the present invention, the slip gear coupling portion is provided on the output shaft 80, so that when an external force greater than a preset force is applied to the driven body to which the output shaft 80 is connected, the upper and lower slip gears 81a and 81b are Slip is generated between the gear joints and the return of the driven body is suppressed. As a result, by using the actuator 100 of the present invention, it is possible to prevent damage to the internal structure due to the return of the driven body.

Below, a method of assembling the actuator 100 according to an embodiment of the present invention will be described with reference to FIGS. 5 and 8A to 8C.

First, the rotor shaft bearing 36 and the output shaft bearings 61 and 62 are inserted and formed on the bottom surface of the body case 12 forming the housing 10, and then the stator 40 and the rotor 30 are connected to the first Prepare the drive motor 50 by assembling it in the receiving space 15a (S11).

Afterwards, the PCB (51) is installed on the upper part of the driving motor (50) and fixed (S12).

Next, the worm wheel 72 of the gear train 70 on the upper part of the PCB 51 is gear-engaged to the first worm gear 35 formed integrally with the rotor 30 (S13).

Next, while assembling the output shaft 80 to the output shaft bearings 61 and 62 formed on the bottom of the body case 12, the worm wheel 82 of the output shaft 80 is geared to the output worm gear 73 of the gear train 70. Combine (S14).

In this case, the gear train 70 assembly step (S13) and the output shaft 80 assembly step (S14) can be performed in a different order.

Afterwards, the cover 11 in which the output shaft bearing 63 is embedded is assembled on the upper part of the body case 12 (S15).

In addition, as shown in FIGS. 8A and 8B, the drive motor 50 of the present invention improves the problem of the conventional structure using a DC motor laid down inside a low-height housing, and the cover of the housing 10 The BLDC drive motor 50 with a vertical assembly structure is implemented by installing bearings at the bottom of the body case 11 and 12 and assembling the BLDC motor in the form of an Al motor.

As described above, in the present invention, a bearing insertion space for the drive motor 50 is provided at the bottom of the cover 11 and the body case 12, and a structure is provided to rotatably support the rotor 30 to the top and bottom. Since it can be assembled inside the housing 10 without using a separate casing, the assembly process is simple and can be manufactured at a low cost.

In addition, since there is no separate outer case for the drive motor 50, the motor size can be increased and the output torque of the motor can be increased. Moreover, in the present invention, by installing a Hall sensor IC on the lower surface of the PCB 51, the magnetic pole of the magnet 31 is sensed when the rotor 30 located on the lower side rotates, and the rotor position signal is easily and accurately detected to control the rotor. (30) Precision control is possible, and operation is possible without employing a separate position sensing magnet like a conventional DC motor.

As shown in FIGS. 8A to 8C, the actuator of the present invention includes a pair of bearings 74a and 74b for receiving and rotatably supporting both ends of the power transmission shaft 71 on the upper sides of the body case 12. Bearing housings (75a, 75b) that accommodate/support are formed integrally, and the cover (11) accommodates both sides of the power transmission shaft (71) and prevents them from being separated, thereby preventing bending of the power transmission shaft (71). The first and second guide projections 11c and 11d are installed at intervals.

Accordingly, it is possible to prevent the power transmission shaft 71 from being bent or separated due to a very strong external pressure being applied to the cover 11, thereby preventing normal operation.

In the present invention, the BLDC method is difficult to apply to general motors used in actuators, but in the present invention, the motor is erected vertically and the size in the radial direction is increased to increase the motor torque, and the drive motor 50 is used to enable position sensing in the vertical direction. A printed circuit board (PCB) 51 with a motor drive circuit that generates a motor drive signal upon receipt of an external control signal is mounted on the upper side, and a Hall sensor IC (not shown) can be easily installed on the PCB 51. This allows precise control of the rotor 30.

The drive motor 50 employed in the actuator 100 of the present invention has a stator 40 and a rotor 30 disposed on the bottom of the housing 10, and uses an inner rotor type BLDC motor.

Figure 9a is a partially enlarged perspective view of a stator to which a conventional press fit terminal is applied, and Figures 9b to 9d respectively show the connection structure between the BLDC type drive motor and the PCB on which the motor drive circuit is mounted according to an embodiment of the present invention. For illustrative purposes, a perspective view of a stator with a press-fit terminal applied, a perspective view of the press-fit terminal, and a cross-sectional view showing a structure in which the press-fit terminal is coupled to the bobbin.

Generally, in order to interconnect the stator coil of a drive motor and a printed circuit board (PCB) on which the motor drive circuit is mounted, soldering is performed to achieve an electrical connection between the coil and the PCB using a terminal.

As a method of connecting without soldering, conventionally, the press fit terminal 46 shown in FIG. 9A is used to press fit into the PCB without soldering. The terminal 46, which is press-fitted into the PCB, is inserted while shrinking on the inside due to the thinness of the shrinkable joint located at the bottom. When fully inserted into the PCB, the top is straightened again by tension, forming a pin used for interconnection without soldering. am.

General press-fit terminal products have an inner hole and are press-fitted into the PCB hole by tension. However, the conventional press-fit terminal with an inner hole has the disadvantage of having a complicated mold structure and high product cost.

In order to solve this problem, the present invention uses a press-fit terminal without an inner hole, as shown in FIGS. 9B to 9D.

As shown in FIGS. 9C and 9D, the press fit terminal 47 of the present invention has a coil connection portion 47c connected to the stator coil 43 at the top, and a bobbin ( When press-fitting into the bobbin 44, a protruding protrusion 47b is formed that is caught in the stopper storage hole provided in the bobbin 44 and serves as a height stopper, and when press-fitting the bobbin 44, the lower part of the body 47a is formed. It has a structure with a hook 47d to prevent separation.

The press-fit terminal 47 is designed to play the same role by eliminating the inner hole that shrinks when pressed into the PCB and widening the inner hole to about 1/2 or 1/3 of the product thickness. .

As described above, the actuator 100 using a small drive motor of the present invention uses a low-cost press-fit terminal 47 without an inner hole to interconnect the stator coil 43 of the drive motor 50 and the PCB 51. ) is used to connect the stator (40) and the PCB (51).

In the actuator 100 according to the present invention, the drive motor 50 operates the coil 43 in a U, V, W three-phase structure when the coil 43 of the stator 40 is wound around a plurality of teeth 41. The other end of the U, V, and W three-phase coil 43 may be connected in a star-connected manner. Moreover, the drive motor 50 can be driven, for example, in a 6-step radio wave drive method using an inverter after receiving rotor position signals from two or three Hall sensors in the motor drive circuit. .

Below, the operation of the actuator 100 according to the present invention will be described with reference to FIGS. 1 to 9D.

The actuator 100 of the present invention first operates the BLDC drive motor 50 installed on the bottom of the housing 10, and the rotor 30 rotates, and the first worm gear 35 integrally formed on the upper side of the rotor 30 also rotates in the same direction.

When the first worm gear 35 rotates, the worm wheel 72 of the gear train 70 coupled to the first worm gear 35 rotates and the power transmission shaft 71 also rotates.

As a result, the output worm gear 73 formed on the other side of the power transmission shaft 71 rotates the output worm wheel 82 of the gear-coupled output shaft 80.

Accordingly, when the output shaft 80 rotates according to the rotation of the output worm wheel 82, the output coupling portion 20 coupled to the second axis 83b of the output shaft 80 extending to the outside of the body case 12. The driven body rotates as it rotates.

In the present invention, when the BLDC drive motor 50 rotates at, for example, 800 rpm, the speed is reduced to 400:1 through the gear train 70, and the rotation speed of the output shaft 80 is lowered to 2 rpm, thereby greatly increasing torque. will come true.

In the above, the present invention has been shown and described by taking specific preferred embodiments as examples, but the present invention is not limited to the above-described embodiments and is within the scope of the spirit of the present invention and is within the scope of common knowledge in the technical field to which the invention pertains. Various changes and modifications will be possible by those who have it.

The present invention can be applied to a driving device for an actuator that moves forward or backward or rotates a driven body.

10: Housing 11: Cover
11a, 11b: circular protrusion 11c, 11d: guide protrusion
12: Body case 12a-12c: Protrusion
11c, 22, 25: Through hole 13a-13d: Support bracket
14: Bearing housing 15a, 15b: Accommodating space
20: output coupling part 21: key
30: rotor 31: magnet
32: back yoke 34: rotor support
35,73: Worm gear 36: Rotor shaft bearing
40: Stator 41: Teeth
42: back yoke 43: coil
44: bobbin 44a, 44b: insulator
45: stator core 46,47: terminal
50: Drive motor 51: PCB
60,75a,75b: Bearing housing 61~64,74a,74b: Bearing
70: Gear train 71: Power transmission shaft
72,82: Worm wheel 80: Output shaft
81a,81b: slip gear 83a,83b: shaft
83c: keyway 100: actuator

Claims (8)

A housing including a rectangular cylindrical body case with an open top and first and second accommodating spaces therein, and a cover covering the upper part of the body case;
A BLDC (Brushless DC) drive motor is installed in the first accommodation space of the housing in a vertical direction from the body case and generates rotational output from the rotor,
The BLDC type drive motor includes a rotor supported on a rotor support and a stator disposed with an air gap outside the rotor,
A bearing housing 14 is provided in the first accommodation space 15a of the body case 12 to rotatably support the lower end of the rotor support 33 when the rotor 30 of the drive motor 50 rotates. It is formed to protrude integrally from the bottom of the body case 12,
A driving device for an actuator in which a first worm gear for transmitting the rotational output of the driving motor to the outside is integrally formed on the upper outer periphery of the rotor support. According to paragraph 1,
A driving device for an actuator in which the lower end of the rotor support body is cup-shaped. According to paragraph 2,
A rotor shaft bearing 64 is inserted into the bottom of the cover 11 to rotatably support the upper part of the rotor support 33,
A driving device for an actuator in which a circular protrusion (11b) protrudes from the upper surface of the cover (11) to secure a space into which the rotor shaft bearing (64) is inserted. delete According to paragraph 1,
The stator is
A stator core including a plurality of teeth, each of which has a "T"-shaped tip extending in the axial direction, and a back yoke that is interconnected with the plurality of teeth to form a magnetic circuit;
Upper and lower insulators surrounding the coil winding area of each of the plurality of teeth from the top and bottom; and
It includes a coil wound on the outer peripheral surface of the upper and lower insulators,
A driving device for an actuator wherein the back yoke is formed in a square shape and a through hole is formed at a corner of the square shape for fixing the back yoke to the body case. According to paragraph 1,
It is disposed on top of the drive motor and further includes a printed circuit board (PCB) on which a motor drive circuit is mounted,
A driving device for an actuator that uses a press-fit terminal without an inner hole and whose tip is press-fitted into the PCB to interconnect the stator coil of the driving motor and a printed circuit board (PCB). delete According to clause 6,
A driving device for an actuator further comprising a Hall sensor installed on the lower surface of a printed circuit board (PCB) corresponding to the upper part of the rotor and generating a rotor position signal when the rotor rotates.

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